The Reaction of Grignard Reagents with Bunte Salts: A Thiol-Free Synthesis of Sulfides
作者:Jonathan T. Reeves、Kaddy Camara、Zhengxu S. Han、Yibo Xu、Heewon Lee、Carl A. Busacca、Chris H. Senanayake
DOI:10.1021/ol500067f
日期:2014.2.21
react with Grignardreagents to give sulfides in good yields. The S-alkyl Bunte salts are prepared from odorless sodium thiosulfate by an SN2 reaction with alkyl halides. A Cu-catalyzed coupling of sodium thiosulfate with aryl and vinyl halides was developed to access S-aryl and S-vinyl Bunte salts. The reaction is amenable to a broad structural array of Bunte salts and Grignardreagents. Importantly
S-烷基,S-芳基和S-乙烯基硫代硫酸钠盐(Bunte盐)与Grignard试剂反应生成硫化物,收率很高。S-烷基邦特盐是由无味的硫代硫酸钠通过与烷基卤化物的S N 2反应制备的。开发了铜催化的硫代硫酸钠与芳基卤化物和乙烯基卤化物的偶联物,以得到S-芳基和S-乙烯基丁烯酸盐。该反应适合于多种结构的邦特盐和格氏试剂。重要的是,这种硫化物的途径避免了使用恶臭的硫醇原料或副产物。
Stereoselective synthesis of di- and trisubstituted alkenes via intermolecular addition of vinyl radicals to alkenes
Vinyl radicals, generated from the reaction of vinyl iodides with tributylstannyl radical, react with electron-deficient alkenes to give di- or trisubstitutedalkenes in moderate to good yields. The stereoselectivity is largely dependent on the substituent at 1- and 2-position of vinyl iodides.
A cobalt complex, [CoCl2(dpph)] (DPPH = [1,6-bis(diphenylphosphino)hexane]), catalyzes an intermolecular styrylation reaction of alkyl halides in the presence of Me3SiCH2MgCl in ether to yield beta-alkylstyrenes. A variety of alkyl halides including alkyl chlorides can participate in the styrylation. A radical mechanism is strongly suggested for the styrylation reaction. The sequential isomerization/styrylation
Sphingosine Analogs, Compositions, and Methods Related Thereto
申请人:Emory University
公开号:US20140309275A1
公开(公告)日:2014-10-16
The disclosure relates to compounds, pharmaceutical compositions, and methods of treating or preventing disease. In certain embodiments, the disclosure relates to methods of treating an infection or cancer comprising administering a pharmaceutical composition disclosed herein to a subject in need thereof. In a typical embodiment, one administers a pharmaceutical composition comprising sphingosine or a sphingosine analog to a subject at risk for, exhibiting symptoms of or diagnosed with a malaria infection.
The reduction of organic halides with tributyltin hydride in the presence of a catalytic amount of triethylborane has been studied. (1) Alkyliodides and alkyl bromides reacted easily with tin hydride at −78°C to give the corresponding hydrocarbons, while alkyl chlorides were sluggish to react and recovered unchanged. (2) The reduction of alkenyl halides such as 1-deuterio-1-iodo-1-dodecene and 1-